<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    
</body>

<script>

//    求一组数据的和
//     var num = 0;
//     for(var i = 1;i<=100;i++){
//         num += i;
//     }
//     console.log(num)


</script>
</html>